Mathematical Modeling of an Absorption Chiller System Energized by a Hybrid Thermal System: Model Validation

Prasartkaew, Boonrit

doi:10.1016/j.egypro.2013.06.744

Cited by 11 publications

(8 citation statements)

References 5 publications

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“…In response to the need for alternative energy sources, solar cooling technologies have become an important factor especially in hot countries due to the huge amount of solar radiation and the need for cooling. Solar cooling systems are environmentally friendly compared to conventional cooling systems and an important technology to reduce gas emissions [3]. Pazheri et al [4] estimated that a 20 MW solar plant, which would need an area of 1.25 km 2 , can generate 200 to 300 GWh/year and could save 500,000 barrels of oil per year.…”

Section: Introductionmentioning

confidence: 99%

Improving Thermal and Electrical Efficiency in Photovoltaic Thermal Systems for Sustainable Cooling System Integration

Alobaid¹,

Hughes²,

O’Connor³

et al. 2018

J. sustain. dev. energy water environ. syst.

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Research into photovoltaic thermal systems is important in solar technologies as photovoltaic thermal systems are designed to produce both electrical and thermal energy, this can lead to improved performance of the overall system. The performance of photovoltaic thermal systems is based on several factors that include photovoltaic thermal materials, design, ambient temperature, inlet and outlet fluid temperature and photovoltaic cell temperature. The aim of this study is to investigate the effect of photovoltaic thermal outlet water temperatures and solar cell temperature on both electrical and thermal efficiency for different range of inlet water temperature. To achieve this, a mathematical model of a photovoltaic thermal system was developed to calculate the anticipated system performance. The factors that affect the efficiency of photovoltaic thermal collectors were discussed and the outlet fluid temperature from the photovoltaic thermal is investigated in order to reach the highest overall efficiency for the solar cooling system. An average thermal and electrical efficiency of 65% and 13.7%, respectively, was achieved and the photovoltaic thermal mathematical model was validated with experimental data from literature.

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Section: Introductionmentioning

confidence: 99%

Improving Thermal and Electrical Efficiency in Photovoltaic Thermal Systems for Sustainable Cooling System Integration

Alobaid¹,

Hughes²,

O’Connor³

et al. 2018

J. sustain. dev. energy water environ. syst.

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“…The relative annual benefit (RNAB) was defined as the annual profit from the use of solar system instead of the reference system which included heat pump grid electricity dependent to provide cooling and heating for the space and gas fired water heater to provide domestic hot water. The finding in this study reported that the optimum value for a stand-alone system for the CCHP were 9 CPVTs, 5 PVs, 1.97 m 3 water storage tank and 33.99 kWh battery while exergy efficiency and RNAB were 9.1% and 6279$/year respectively. The work concluded a good correlation between the simulation and experimental results that were reported from the CPVT manufacturer.…”

Section: U N C O R R E C T E D P R O O Fmentioning

confidence: 67%

“…Simple payback period (SPP) is an economic indicator that calculate the time required to pay the different between the capital cost of the proposed solar system and the reference system from the operation cost saving. The expression of SPP is written as: (3) is the difference between the capital cost of the proposed and the reference system and represents the difference between the operation cost for the reference and proposed solar systems.…”

Section: Economic Viabilitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A review of solar driven absorption cooling with photovoltaic thermal systems

Alobaid

Hughes

Calautit

et al. 2017

Renewable and Sustainable Energy Reviews

105

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The aim of this investigation is to evaluate the recent advances in the field of solar absorption cooling systems from the viewpoint of solar collector types. A review in the area of photovoltaic thermal (PVT) absorption cooling systems is conducted. This review includes experimental and computational work focusing on collector types and their efficiencies and performance indicators. Compared to vapour compression air conditioning systems, 50% of primary energy was saved by using solar absorption cooling systems and 10-35% maximum electrical efficiency of PVT was achieved. This review shows that Coefficient of Performance (COP) for solar cooling systems is in the range of 0.1-0.91 while the thermal collector efficiencies are in the range of 0.06-0.64. The average area to produce cooling for single effect absorption chillers for experimental and computational projects is 4.95 m 2 /kW c and 5.61 m 2 /kW c respectively. The specific area for flat plat collector (FPC) is in the range of 2.18-9.4 m 2 /kW c , while for evacuated tube collector (ETC) is in the range of 1.27-12.5 m 2 /kW c. For concentrated photovoltaic thermal collector (CPVT) and PVT, the average area to produce cooling for solar absorption chillers are 2.72 m 2 /kW c and 3.1 m 2 /kW c respectively.

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“…The water absorption chiller consists of three parts, a high temperature generator, a refrigeration system and an evaporator [31,32]. Each component is modeled as a black-box using input-output data.…”

Section: Absorption Machine Modelmentioning

confidence: 99%

Hybrid Nonlinear MPC of a Solar Cooling Plant

et al. 2019

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Solar energy for cooling systems has been widely used to fulfill the growing air conditioning demand. The advantage of this approach is based on the fact that the need of air conditioning is usually well correlated to solar radiation. These kinds of plants can work in different operation modes resulting on a hybrid system. The control approaches designed for this kind of plant have usually a twofold goal: (a) regulating the outlet temperature of the solar collector field and (b) choosing the operation mode. Since the operation mode is defined by a set of valve positions (discrete variables), the overall control problem is a nonlinear optimization problem which involves discrete and continuous variables. This problems are difficult to solve within the normal sampling times for control purposes (around 20–30 s). In this paper, a two layer control strategy is proposed. The first layer is a nonlinear model predictive controller for regulating the outlet temperature of the solar field. The second layer is a fuzzy algorithm which selects the adequate operation mode for the plant taken into account the operation conditions. The control strategy is tested on a model of the plant showing a proper performance.

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Mathematical Modeling of an Absorption Chiller System Energized by a Hybrid Thermal System: Model Validation

Cited by 11 publications

References 5 publications

Improving Thermal and Electrical Efficiency in Photovoltaic Thermal Systems for Sustainable Cooling System Integration

Improving Thermal and Electrical Efficiency in Photovoltaic Thermal Systems for Sustainable Cooling System Integration

A review of solar driven absorption cooling with photovoltaic thermal systems

Hybrid Nonlinear MPC of a Solar Cooling Plant

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